I have a plethora of niche-based iOS apps for skydivers, beer enthusiasts, and people in direct sales. Bring in about 1-2k a month, but I actively maintain about half of the apps and am actively developing new apps.

Since January, I've netted roughly $13,000 after Apple's 30% cut. I also make income through Apple's affiliate links that are automatically applied to my apps on my website - http://mohawkapps.com